First slide

Coherent sources and their importance in interference

Question

Two parallel slits 0.6 mm apart are illuminated by light source of wavelength 6000 Å. The distance between two consecutive dark fringes on a screen 1 m away from the slits is

Easy

A

1 mm
B

0.01 mm
C

0.1 m
D

10 m

Solution

Distance between two consecutive Dark fringes = $\frac{λD}{d} = \frac{6000 \times 10^{- 10} \times 1}{0 .6 \times 10^{- 3}} = 1 mm$

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